Calling Webservice from Netweaver Portal to SAP XMII 12.0 using SSO

Hello,
we have a Netweaver 2004s based Portal and a Netweaver-based SAP XMII (v12.0) System providing Webservices.
What we try to do is to call a webservice out of the Portal EAR Application using SSO.
SSO-Konfiguration between Portal and XMII is done and works fine. I tested this using an URL-iView, which calls a https-URL on XMII and SSO-Authentification is done in the background.
Now I want to call a Webservice using SSO.
Without SSO (prodiving UID/PW), the webservice-call works fine.
In order to use SSO with Webservice, I created a "Deployable Webservice Proxy" with "HTTP-Authentication" and "use SAP Logon Ticket" turned on.
Then I remove Login/Password from my SOAP-Request and unfortunately it doesn't work.
What do I have to consider in addition to the topics above?
Can you provide any useful links with tutorials, hints, documentation, ...?
Thanks in advance
Andreas

> Can you please list all the options that we have in order to implement SSO for EP and SAP GUI?
>
> I could not find any info in regards to the advantages and disadvantages of each SSO solution. Do you have any links that gives this information?
If you search the forum here for the terms you have used, then you will find many of them and interesting discussions about advantages and disadvantages from different views. I think that in 1 or 2 hours you will be a guru
> I am thinking more of using Kerberos authentication for SAP GUI and using OpenSSO (Sun's product)solution for EP 7.0.
>
> Do you know what SSO technologies are other companies implementing these days?
I only know which solutions I have been involved in doing the security evaluations for and implementation support.
I don't want to do any direct or indirect comparative advertizing here, but only wanted to point out to you that there is plenty of information if you use the search. What you need to understand is that other that SAP proprietary mechanisms and newer standards based initiatives (search for 'SAML'), this is often a 3rd party vendor question (and resulting discussion...).
If you find a solution and want to specifically discuss it here, then this can most of the time be done in a civilized way...
Cheers,
Julius

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